**Final Update on Event-Level Debugging:** Using the `acpi_listen` tool, I have confirmed that there is **no unique ACPI event** generated when the laptop is folded into tablet mode or unfolded back into laptop mode.
The only events captured are from the WMI interface (`PNP0C14:01` and `PNP0C14:02`), which correspond to the AMD Sensor Fusion Hub (the accelerometer). These events fire continuously when the device is tilted, but no distinct event is associated with the hinge action itself. This, combined with the lack of any `uevent` from `udevadm monitor` and the physical toggling of the Fn key backlight, provides definitive proof that the Embedded Controller (EC) is not exposing the tablet mode switch to the kernel's ACPI driver layer. A software hotfix is not possible as there is no event to listen to. The fix must be implemented in the kernel driver (`hp-wmi` or similar) to recognize the proprietary signal this hardware uses for its mode switch. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2137359 Title: Automatic screen rotation not working on HP OmniBook X Flip (16-ar0xxx) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2137359/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
